Arduino Boards

QUICK OVERVIEW
Operating Voltage: 5 V.
Input Voltage: 7-12 V.
Input Voltage: 6-20 V.
Digital I/O Pins: 14 (of which 6 provide PWM output).
Analog Input Pins: 8.
DC Current per I/O Pin: 40 mA.

QUICK OVERVIEW
8 analog input port: A0 ~ A7.
A pair of TTL level serial port transceiver : RX / TX.
6 PWM port: D3, D5, D6, D9, D10, D11.
Clock frequency: 8MHz.